Shorter eating times

I've been worried that my LO hasn't been eating enough because she's only latching for like 15 mins when it was at least 30 before. She's also going longer between feeds. Que panic. I couldn't convince her to eat earlier so I had to pump. I don't respond well to the pump but I still pumped 3oz in like 10 mins! I can only imagine how much this little monster gets in 15 😁 guess I don't need to worry so much

How long is too long for a 4 week old to go between feedings? How much should she be eating each time oz wise?